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Uptake of Hypobromous Acid (HOBr) by Aqueous Sulfuric Acid Solutions: Low-Temperature Solubility and Reaction (January 13, 2005)

Author: Iraci, Laura T.; Michelsen, Rebecca R.; Ashbourn, Samatha F. M.; Rammer, Thomas A.; Golden, David M
Subject: AIR TRANSPORTATION; AIRPORTS; FORECASTING; PASSENGERS; STATISTICAL ANALYSIS; EGYPT; POPULATIONS; ACCEPTABILITY
Year: 2005
Language: English
Book contributor: NASA
Collection: nasa_techdocs

Description

Hypobromous acid (HOBr) is a key species linking inorganic bromine to the chlorine and odd hydrogen chemical families. We have measured the solubility of HOBr in 45 - 70 wt% sulfuric acid solutions representative of upper tropospheric and lower stratospheric aerosol composition. Over the temperature range 201 - 252 K, HOBr is quite soluble in sulfuric acid, with an effective Henry's law coefficient, H = 10(exp 4) - 10(exp 7) mol/L/atm. H is inversely dependent on temperature, with Delta H = -46.2 kJ/mol and Delta S = -106.2 J/mol/K for 55 - 70 wt% H2SO4 solutions. Our study includes temperatures which overlap both previous measurements of HOBr solubility. For uptake into aqueous 45 wt% H2SO4, the solubility can be described by log H = 3665/T - 10.63. For 55 - 70 wt% H2SO4, log H = 2412/T - 5.55. At temperatures colder than approx. 213 K, the solubility of HOBr in 45 wt% H2SO4 is noticeably larger than in 70 wt% H2SO4. The solubility of HOBr is comparable to that of HBr, indicating that upper tropospheric and lower stratospheric aerosols should contain equilibrium concentrations of HOBr which equal or exceed those of HBr. Our measurements indicate chemical reaction of HOBr upon uptake into aqueous sulfuric acid in the presence of other brominated gases followed by evolution of gaseous products including Br2O and Br2, particularly at 70 wt% H2SO4.

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Identifier:	nasa_techdoc_20050158741
Document-source:	CASI
Documentid:	20050158741
Nasa-center:	Ames Research Center
Online-source:	http://wayback.archive-it.org/1792/20100128073717/http://hdl.handle.net/2060/20050158741
Original-nasa-rights:	Unclassified; Copyright; Unlimited; Publicly available;
Updated-added-to-ntrs:	2009-07-29
Licenseurl:	http://creativecommons.org/licenses/publicdomain/
Mediatype:	texts
Rights:	Public Domain
Identifier-access:	http://www.archive.org/details/nasa_techdoc_20050158741
Identifier-ark:	ark:/13960/t72v3f81j
Ppi:	300
Ocr:	ABBYY FineReader 8.0